Monitor arm



FIG. 1 is a perspective view of the monitor arm embodying the new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is another perspective view thereof, further illustrating monitor and desk attachment mechanisms.

Broken lines are used to illustrate features of the monitor arm that form no part of the claimed design. 

CLAIM The ornamental design for a monitor arm, as shown and described. 